A tense on-air fight between RFK Jr. and CNN over vaccines turned into a standoff, a bad look for both sides in an already bitter public health debate.

• RFK Jr. repeatedly demanded CNN point to a single study proving the COVID vaccine protected children and did more good than harm.
• CNN countered that vaccine misinformation may have cost 100,000 to 200,000 American lives, but could not name the specific study on the spot.
• The exchange grew heated, with both sides talking over each other and accusing the other of citing studies that "don't exist."
• The clash then pivoted toward measles, with rising US cases raised as a live concern.

Outlook: Expect the fight over vaccine science and RFK Jr.'s health policy to keep flaring in the media with no resolution in sight.